Do not believe a thing because many people speak of it

I know Australia has this. Compulsory voting is a system in which voters are obliged to vote in elections or attend a polling place on voting day. If an eligible voter does not attend a polling place, or lodge a postal vote, he or she may be subject to a penalty such as fines or community service. As of August 2013, 22 countries, including 12 Latin American countries, have laws for compulsory voting and 11 of these 22 countries enforce these laws in practice.

I am not a fan of government intruding in our lives but this idea intrigues me.